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Presumably, a debt, large or small, can be paid in any sort of Congressionally-authorized currency (or money or coinage or whatever term you like). There used to be, more than 20 years ago, a law that said that payments above a certain amount (like $20) could not be paid "in minor coins" -- this was deliberately concocted to prevent those spiteful payments of taxes or alimony with tons of pennies; but this provision no longer appears in the US Code.
Arguably you could, now, pay your taxes in pennies. But there are machines that can sort and count bushels of coins in a minute, and in return you'd have to lug around hundreds of pounds of coins at considerable trouble and expense to yourself.